Slip at Molten Polymer-Polymer Interfaces


A number of researchers have reported an anomalous lowering of viscosity in immiscible polymer blends. Slip at the interfaces between the polymers has been proposed to explain these observations. Because of the complex morphology developed in melt blends it is difficult to test the slip hypothesis. However, using layer multiplication dies in coextrusion, two or more polymers can be alternatively combined into hundreds or even thousands of continuous layers generating a large amount of well-defined interfacial area. Polypropylene (PP) and polystyrene (PS) with closely matched viscosity were blended in a twin screw extruder and also coextruded into 2, 32, 128 alternating layers. The steady shear and dynamic shear viscosity of the blends was measured in a capillary rheometer and a rotational shear rheometer using parallel plates geometry. While the steady shear viscosity of the blends was lower than that of both homopolymers, the dynamic shear viscosity of the blends was the same as that of the homopolymers. The pressure drop of the coextruded multilayer melts through a slit die was lower than that of both homopolymers and decreased with an increase in the number of layers. From these results interfacial slip viscosity and velocity were estimated. Addition of diblock copolymer was able to suppress interfacial slip.

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  1. 1.

    L. A. Utracki and M. R. Kamal, Polym Eng Sci, 22, 96 (1982).

    Article  Google Scholar 

  2. 2.

    L. A. Utracki, Polym Eng Sci, 23, 602 (1983).

    CAS  Article  Google Scholar 

  3. 3.

    C. K. Shih, Polym Eng Sci, 16, 742 (1976).

    CAS  Article  Google Scholar 

  4. 4.

    M. Kapuscinski and H. P. Schreiber, Polym Eng Sci, 19, 900 (1979).

    CAS  Article  Google Scholar 

  5. 5.

    S. Danesi and R. S. Porter, Polymer, 19, 448 (1978).

    CAS  Article  Google Scholar 

  6. 6.

    N. Alle and J. Lyngaae–Jorgensen, Rheolog Acta, 19, 94 (1980).

    CAS  Article  Google Scholar 

  7. 7.

    C. D. Han and T. C. Yu, J Appl Polym Sci, 15, 1163 (1971).

    CAS  Article  Google Scholar 

  8. 8.

    Y. S. Liptov, V. F. Shumsky, A. N. Gorbatenko, Y. N. Panov and L. S. Bolotnikova, J of Appl Polym Sci, 26, 499 (1981).

    Article  Google Scholar 

  9. 9.

    C. D. Han and T. C. Yu, Polym Eng Sci, 12, 81 (1972).

    CAS  Article  Google Scholar 

  10. 10.

    J. G. Carley, Preprints SPE Reg Conf on Plast Progr Proc, 285 (1980).

  11. 11.

    J. Brandrup and E. H. Immergut, Polymer Handbook, 3rd, ed. J. Brandrup and E. H. Immergut (1989).

  12. 12.

    E. Helfand and Y. Tagami, J Chem Phys, 56, 3592 (1972).

    CAS  Article  Google Scholar 

  13. 13.

    S. Wu, Polymer Interface and Adhesion, 126 (1982).

  14. 14.

    C. C. Lin, Polym J, 11 185, 1979.

    CAS  Article  Google Scholar 

  15. 15.

    J. Lyngaae–Jorgensen, L. D. Thomsen, K. Rasmussen, K. Sondergaard and F. E. Andersen, Intern Polym Processing, 2, 123 (1988).

    Article  Google Scholar 

  16. 16.

    A. Cohen and R. Schroeder, J Rheology, 34, 685 (1990).

    Article  Google Scholar 

  17. 17.

    J. Zhao, L. Mascia and V. Nassehi, Advance in Polym Technology, 16, 209 (1997).

    CAS  Article  Google Scholar 

  18. 18.

    M. Bousmina, J. F. Palierne and L. A. Utracki, Polym Eng Sci, 39, 1049 (1999).

    CAS  Article  Google Scholar 

  19. 19.

    A. Rudin, A. T. Worm and J. E. Blacklock, J Plast Film Sheet, 1, 3 (1985).

    Article  Google Scholar 

  20. 20.

    S. Nam, Intern Polym Processing, 1, 98 (1987).

    CAS  Article  Google Scholar 

  21. 21.

    A. Valenza and F. P. La Mantia, Intern Polym Processing, 2, 3 (1988).

    Google Scholar 

  22. 22.

    C. M. Chan and J. Feng, J Rheol, 41, 319 (1997).

    CAS  Article  Google Scholar 

  23. 23.

    H. Furakawa, Phys Rev, A40, 6403 (1989).

    Article  Google Scholar 

  24. 24.

    F. Brochard, P. G. de Gennes and S. Troian, C R Acad Sc (Paris), II310, 1169 (1990).

    Google Scholar 

  25. 25.

    P. G. de Gennes, Mecanical Properties of Polymer Interfaces; ed. I. C. Sarchez (Butterworth-Heinemann, 1992), pp. 55–71.

  26. 26.

    P. G. de Gennes, C R Acad Sc (Paris), B288, 219 (1979).

    Google Scholar 

  27. 27.

    J. L. Goveas and P. G. Fredrickson, European Physical Journal, B2, 79 (1998).

    Article  Google Scholar 

  28. 28.

    S. Wu, Polym Eng and Sci, 27, 335 (1987).

    CAS  Article  Google Scholar 

  29. 29.

    C. W. Macosko, SPE ANTEC, 2, 2548 (1998).

    Google Scholar 

  30. 30.

    Y. P. Miroshnikov and E. N. Andreeva, Vysokomol Soedin, A29, 579 (1987).

    Google Scholar 

  31. 31.

    Ing. R. Sluijters, Chemische Techniek, 3, 33 (1965).

    Google Scholar 

  32. 32.

    W. J. Schrenk and T. Alfrey, Polym Eng Sci, 9, 393 (1969).

    CAS  Article  Google Scholar 

  33. 33.

    W. J. Schrenk and T. Alfrey, Polymer Blends, ed. D. R. Paul and S. Newman (Academic Press, 1978), 2, pp. 129–165.

    CAS  Article  Google Scholar 

  34. 34.

    T. Saito and C. W. Macosko, SPE ANTEC, 1, 967 (1998).

    Google Scholar 

  35. 35.

    P. A. Weimann, T. D. Jones, M. A. Hillmyer, F. S. Bates, J. D. Londono, Y. Melnichenko, G. D. Wignall and K. Almdal, Macromolecules, 30, 3650 (1997).

    CAS  Article  Google Scholar 

  36. 36.

    J. F. Palierne, Rheolog Acta, 29, 204 (1990).

    CAS  Article  Google Scholar 

  37. 37.

    D. Graebling, R. Muller and J. F. Palierne, Macromolecules, 26, 320 (1993).

    CAS  Article  Google Scholar 

  38. 38.

    R. E. Riemann, H. J. Cantow and C. Friedrich, Macromolecules, 30, 5476 (1997)

    CAS  Article  Google Scholar 

  39. 39.

    C. Lacroix, M. Grmela and P. J. Carreau, J Rheology, 42, 41 (1998).

    CAS  Article  Google Scholar 

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Correspondence to Rui Zhao.

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Zhao, R., Macosko, C.W. Slip at Molten Polymer-Polymer Interfaces. MRS Online Proceedings Library 629, 21 (2000).

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